7. Subjects and their partners must be willing to avoid pregnancy during the trial and until three months after the last trial treatment. Male subjects with female partners of childbearing potential and female subjects of childbearing potential must, therefore, be willing to use adequate contraception as approved by the investigator, such as a two-barrier method or one-barrier method with spermicide or intrauterine device. This requirement begins two weeks before receiving the first trial treatment and ends one month after receiving the last treatment.